Clarify behavior of multiple rewrite rules in the same scope. refs...

Clarify behavior of multiple rewrite rules in the same scope. refs https://issues.apache.org/bugzilla/show_bug.cgi?id=51968


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1180734 13f79535-47bb-0310-9956-ffa450edef68